I think I've figured out enough of IPFS to try uploading a model and see if it will share.
With Wayne's permission I've repackaged one of his models (Mark B Medium) and put it on IPFS. The URL is:
https://ipfs.io/ipfs/QmPABBt3fyzbXAW..._Cardmodel.pdf
If I could have a volunteer or two to try and download the model (it's 11 Mb in total). If you'd be so kind as to report how it went here.
The documentation says this should work in most modern browsers.
Regards,
Charlie
ps. The benefit of IPFS is that the files become immortal since they are stored as pieces scattered across many machines on the Internet.